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Investigation of fabrication of gas diffusion substrate for proton exchange membrane fuel cells

固化(化学) 碳化作用 材料科学 极限抗拉强度 抗弯强度 复合材料 制作 质子交换膜燃料电池 多孔性 气体扩散 热扩散率 微观结构 化学工程 燃料电池 医学 替代医学 物理 病理 工程类 量子力学
作者
Wangfan Yang,Lijun Zhu,Shuli Wang,Zequan Yin,Liusheng Xiao,Qinsi Shao,Joey Chung‐Yen Jung,Pang‐Chieh Sui
出处
期刊:International Journal of Hydrogen Energy [Elsevier BV]
卷期号:47 (83): 35423-35436 被引量:4
标识
DOI:10.1016/j.ijhydene.2022.08.094
摘要

The gas diffusion substrate (GDS) is essential in the proton exchange membrane fuel cells. Its fabrication techniques affect the performance significantly and are worthy of investigation. In this study, a manufacturing process of the GDS is proposed to understand the formation process of GDS and promote its structure and performance more pertinently. Different states during the preparation process, raw carbon paper, pre-curing, curing, carbonation, and graphitization, are characterized and measured. Experimental and numerical methods are employed to determine the relationships between microstructure, transport, and mechanical performance variation with the fabricating processes. The results show that its porosity, average pore size, and effective diffusivity decrease first and increase after curing. These parameters after graphitization are lower than that of the carbon paper (CP). The electrical resistivity increases dramatically while pre-curing and decreases gradually after curing, carbonation, and graphitization, and it is much reduced after graphitization. Moreover, mechanical measurement results show that both the picks of tensile strength and flexural modulus occur after curing. Its tensile strength shows little change after graphitization compared to the initial paper's. In contrast, the flexural modulus is improved significantly.
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